Phone Cable Wiring Color Code

In a typical home the telephone cables connecting your phones within you home contain four wires. Phone wire color codes the nitty gritty. You may encounter two different wire color schemes while working on your phone wiring.

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Developed in the early 1940s see note at bottom this color code uses only 10 colors divided into 5 group colors and 5 pair colors.

Phone cable wiring color code. The white wire with a blue stripe is terminated on the green tip screw. Repairmen in fact refer to the wires in terms of pairs so technically a standard four wire telephone line has two pairs. The blue pair is connected as the primary telephone line. An easy to understand explanation of the codes is also available.

Color code schemes are used to identify wires within a cable. They are used in pairs for each phone line you have. The first pair has one green wire tip and one red wire ring. Optical fiber cables use a twelve color code where the first ten are the same as in the 25 pair color code and the last two are rose and aqua.

Red green yellow and black. One pair of wires is used for one telephone line. 5 memorizing the colors edit. He covers the pair colors and their positions in the jack and how to convert old wire colors to the new cat 5e colors.

First posted nov 29 2003 last update mar 15 2015. Telephone wiring is color coded. Ron discusses wiring for phone circuits and usoc wiring. The solid blue wire is the ring and gets connected to the red jack terminal.

The simplest color scheme is used on normal station cable what your phone tech may call jk which has only two pairs of wire.